it is a good horse that never stumbles and a good wife that never grumbles

used to imply that making mistakes is a natural part of being human, and nobody is immune to it, regardless of how skilled or experienced they are

The origin of the proverb "it is a good horse that never stumbles and a good wife that never grumbles" is not clearly tied to a specific source but is a part of traditional English folk wisdom. The proverb uses the metaphor of a horse stumbling and a wife grumbling to imply that everyone has their shortcomings, even if they are generally considered good or reliable. It serves as a reminder that occasional flaws or faults are natural and should not overshadow overall qualities.